RecruitingDrug trialEfficacy and Safety of Avatrombopag in the Treatment of Thrombocytopenia After Haplo-HSCTIn this study, investigators aim to evaluate the efficacy of avatrombopag in thrombocytopenic patients after haploidentical hematopoietic stem cell transplantation (haplo-HSCT) through a prospective, multi-center, double-blinded, randomized placebo-controlled clinical trial.